Маркова, Анна Олександрівна, and Валентин Валентинович Серебряков. 2016. “Research of Aggressive Behavior of Blackcap (Sylvia Atricapilla) at Watering Place”. ScienceRise: Biological Science, no. 2 (2) (October):11-17. https://doi.org/10.15587/2519-8025.2016.78979.